Centurion R' Bock 20

2026 YouthGeneral youth Manufacturer page

Suspension: Rigid
Wheels: 20″
Drivetrain: 1 × 7 28t / 11–34t
Gear range: 309%
Weight: 8.8 kg 19.4 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

24cm

The manufacturer did not publish rider heights for these sizes.

Components

20 of 21 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

R' Bock 20 II, Material: Aluminium, 20", Steuerrohr: 1 1/8" straight, Ausfallende: 10x135mm, Bremsaufnahme: IS-mount Not identified

Suspension

1 part

Fork
- Centurion

Drivetrain

6 parts

Bottom bracket
- FSA
TH-7420ST
Cassette
- SunRace 11–34t
Chain
- KMC
Crankset
- Procraft 28t
Rear derailleur
- Shimano Tourney TX RD-TX800 8 speeds
RD-TX800
Shifters
- Shimano Tourney TX
RD-TX800

Brakes

2 parts

Brake levers
- Tektro HD-J285
HD-J285
Brakes
- Tektro HD-J285
HD-J285

Wheels and tires

5 parts

Cockpit and contact points

5 parts

Other components

1 part

Bell
- Procraft

Sizes and geometry

1 size Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size 24cm

Table

Geometry diagram unavailable

The drawing needs reach and stack, which the manufacturer did not publish. Available facts remain in the table.

Size

Complete manufacturer geometry table 1 published size

Complete manufacturer geometry by size
Measurement
Top tube lengthmm	445
Seat tube lengthmm	240
Head tube lengthmm	120
Head tube angle	68°
Seat tube angle	72°
Chainstay lengthmm	360
Wheelbasemm	872
Front centermm	513
Bottom bracket dropmm	20
Standover heightmm	468

Not published by the manufacturer: Reach, Stack, Bottom bracket height, Fork rake, Trail, Stack/reach ratio, Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Bicycle weight: 8.8 kg

19.4 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 28
Largest chainring: 28
Rear sprockets: 7
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 16.5 in
Highest gear: 50.9 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 2.2″
Travel: Front: Additional specification: Not available: Yes
Wheel material: Aluminum
Wheel size: 20″

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.3 km/h
Highest gear: 19.5 km/h

Total gear range 309%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 16.5–50.9 gear inches

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2026 builds
Specification	This bicycle Centurion R' Bock 20	Centurion R' Bock 16	Centurion R' Bock 24	Centurion R' Bock 24 EQ	Centurion R' Bock 24 MTB
Frame
Bicycle weight	8.8 kg	6.7 kg	9.7 kg	13.1 kg	10.9 kg
Suspension
Suspension configuration	Rigid	Rigid	Rigid	Hardtail	Hardtail
Front travel	Not informed	Not informed	Not informed	50 mm	63 mm
Drivetrain
Smallest chainring	28	28	28	28	30
Largest chainring	28	28	28	28	30
Rear sprockets	7	1	9	9	10
Smallest sprocket	11	16	11	11	11
Largest sprocket	34	16	46	46	48
Lowest gear	16.5 in	28.0 in	14.6 in	14.6 in	15.0 in
Highest gear	50.9 in	28.0 in	61.1 in	61.1 in	65.5 in
Brakes
Brake type	Hydraulic disc	Rim brake	Hydraulic disc	Hydraulic disc	Hydraulic disc
Cockpit
Shifting	Mechanical	No shifting	Mechanical	Mechanical	Mechanical
Other specifications
Suspension	Rigid	Rigid	Rigid	Hardtail	Hardtail
Tire width	2.2″	1.5″	1.95″	1.95″	2.1″
Wheel size	20″	16″	24″	24″	24″
Bottom bracket standard	Not informed	Not informed	Not informed	Not informed	BSA
Fork spring	Not informed	Not informed	Not informed	Not informed	Air